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License Agreements - Editas License Agreement - Additional Information (Details)	6 Months Ended
	Jun. 30, 2021 USD ($)
Editas License Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Development regulatory and commercial milestones recognized	$ 0

X

- Definition

The amount of expense recognized during the period for development, regulatory and commercial milestones.

+ References

No definition available.

+ Details

Name:	beam_DevelopmentRegulatoryAndCommercialMilestonesRecognized
Namespace Prefix:	beam_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=beam_EditasLicenseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: